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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7636602a525554ab0d24ed43b622bc963f6d125a41b7226e848fa8117513ecec' 
  AND token = 'q7si7F04Aplk0KiLgsjC7mAdMNSlpRq7MikHTfVNXM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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