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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6131c31309e0b0bbb10e3cb1967d9de9a9320bc05f563f141ba0655a674e24bd' 
  AND token = 'M5GRNL8pwXstDFEn+0C7U8dnx+DUuMevvZ9Xk3Ox0s8=' 
  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"
    }
  }
}