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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df9b35f795a5ab52997a837908e14399627b84eb575573e9b034189ac6af7eb' 
  AND token = 'LahPKMQrHBKIVw2E7lhiSapNB+wPnnv9Ee8i03tt6jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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