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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4715dfbecf982530e5846eb0b8da034630d5f7cef0e80b8082dcbbb5d671a92' 
  AND token = '1yo1UDJuh3YkF88Y9KwoVVrWvzRq6OpQX47xD5eG7uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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