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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ba08a9ed610147fc056232286317384b6d0b11bb18182e3417c9846276d50f' 
  AND token = '0aYs6x8TJdU/+++HyLut1r/40dbYOw1FtRQfkzHxx0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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