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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135848a755ea581b7004832c7f7c5f2f1491e9dc647ca2c099fb2a7aeb6bba7f' 
  AND token = 'Dlqy5vomOzdTJRYMCD9cKRZ3sGxaK0FMooSzUyGSnsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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