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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51d9c57b4d9a50c17653315b95a179d0ce5806ae645c2b21728b66ad8764fc3' 
  AND token = 'Cu8UonmYnXFUohHYCNCMCm1dasd8oRPqqTQ9/A+L2zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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