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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf1e8383b682016791cf6b49a51cf4ec75f70d98a77d471a1a9eb88013e0ba8' 
  AND token = 'XX1ERu7ILNOSaWsjPUTe9pthP8PXQKd3xvgmWVF8YN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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