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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47afd04350d7e72830682f34dda905588f5816acca11b82369e4934181c56dd' 
  AND token = 'pH5bcmGAjcr0e0YoX002af8Eh/RfwRjZl7d/6ce5qjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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