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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2462d457c812a37374e1cc96ddc908fdb1edfbab466d68ace64da8703266d04a' 
  AND token = 'oRwnlyheMK3gK2XwalgVP5e8CoXa9SYcof0o5rT1Jfc=' 
  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"
    }
  }
}