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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f31b40be963dbff35917ec0f01cf1b4ae27f43b0c59eb525a2e0eea0d76c89' 
  AND token = 'N1Bkt9YjzCfLtDOxU6uM+/oRnmhsc8apv5eQ8V4lQz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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