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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b04f617b1feb4d3811041279f3d2c5402fab6ebb48d04ecf7f0976aad1551d' 
  AND token = 'jiGX3UgmtDbl9K/3VQrOC0gn4NcIEpF/srMYGTCTTBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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