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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0904d6e6a8bcb57096543fb8d89a05174655b727a7f6d4964fe8dfb3483083' 
  AND token = 'pBWhm+SYbQAxbLR5+HFqy3kbnagPaeQLS8Smd0a+7qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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