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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc1ca1312f7cd718341d3dee9d8713699ac105e88e2d8b6566452c397f080d1' 
  AND token = 'xPGFlnULfcj9PM+FdUUcEtXfNOmd5+EnY9ORyTx0HIU=' 
  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"
    }
  }
}