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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6032b81b5b8e716a4d1376743889bbfbb876e02c92525bfb7804342cbf17c30a' 
  AND token = 'SG8b4ds3zZEjXSZsNYhHdHGrQfmDOs1Zwxr4CSyOW3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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