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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f00a7b66aad0e047063788dbdbef510c25b8a4d41ccf3f43136d1376460b33b' 
  AND token = 'zBdKW6CKBfIIEYqhIz+TlBEDjCfxwypd4upOi2BY2aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}