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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '774a98fc03b6c4dee06a2179a7d50ea2ac61cac770f79c7171ed6e5e846f4e1e' 
  AND token = 'R180I3aFoVcFd1Elvb3cDiDdU0BA9Y7qP/E/qRr2qzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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