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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e58f3455992adf181108129174a0f45527ec64e77a5f3e92ac556a37d0166a' 
  AND token = '37Ov2j51Td/NjXVRUCOscGa9P0+6AM7KdrhQEKD0d+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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