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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80a7c9bda3113241a90306a11c6bd85f13696ad4cbecd6e7472e7ad2ec23c96' 
  AND token = '634Y0wrONWEYzwbVPV5onsyARWVtZhPxD5ABJRbZHMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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