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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f852359c0bbc297ecffb6b4c86f7eda9e8461a70f808fe89b5eb98ee0106a68' 
  AND token = 'WYH94TKb0pjhk4vQMul8zLDTENx5p1hIU9Crzssvfwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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