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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7968ea6f9ca3fea41189327c073febcbdb9443920ed7ead20354660841c6f7e0' 
  AND token = 'rny7J0tiCinv36M1A37pcyVpnUQn22cVcOxD5H7/fws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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