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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da293fbed350e9d9cf5ccac5376b34d7fd04f41d06e411d1fe92f207a0ad57f' 
  AND token = 'WVPsUTJZ8i17ACr3u88nktbB6VloOG7TO/Jwn+nOKHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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