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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baa0455b844af1d4618aa7194c2db4c23b9c6164f3183a29688add2191f70ac' 
  AND token = '7ATQ75h6ksOmNNxuOcry1mc3q2uk4MegN/aH2wXnUeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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