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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d59b15456076fa8cb7a3e50404a68445fc0a94d52bd5431267ea404d3735ca' 
  AND token = 'mQz6O5lBzi3aE/4sMchke/el1d0SVkGE/lRrodiIDAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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