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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f3a1f7bf912ac49485c6333cba167da57855d4311e8c2b5c43b3212b468226' 
  AND token = '+krPaciGjd+ErieOkBiFk3aglESe+IrfKqAHHGz59Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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