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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9491287594409d1facf2615f2fa6d22ccc16e8fa33e8ce4c4ed7e5ea4e2f915' 
  AND token = 'hxBYHi3JPZy1U8D6xV2IYXBHb5XQVd9P80oPriZDeRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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