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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e198b18b9e0c6d2a16dd3a982a029e2a2f090880c689cc854a0726e4ccc60011' 
  AND token = 'eO577ogc3DJbhOz51slze4z4SDZ0+i7J7b2+WkFLt1Y=' 
  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"
    }
  }
}