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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6eb6e8e0c43333583c5cb266eb942784d0509a1037ffef427fa0abb29c5b5ab' 
  AND token = '5729dhcjnZ5MrRv5XlhKHdxOtJTZtDi33Qs4/kLqjGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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