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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19938428d5430d5197a532f640535ad4c310868df1dcf195b4f561f6f7a5da57' 
  AND token = 'XZ0WATY0+2XJiWtnQUvk0QAtoRnMB3/qwx/CJMBSN3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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