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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bc60846bad3c79bc802810623e8e0b735f085d42e841b5214f94c165a6e223' 
  AND token = '8BAoVpM7/E5xkVgwNsOV+C6uNJBtNHgvqCu5W42Wmnk=' 
  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"
    }
  }
}