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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045ae38dd07753b2b3646a53aef41a6ad9665998d39f7d2201da1a0022fbdf36' 
  AND token = 'pf0L2P9TcyiopUl6ahC+kLvesuhjQSO19MUHxVZN8xk=' 
  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"
    }
  }
}