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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b86e111588e68db98ba0fe441919c7452565711323e7e467e1bfb1dff99083' 
  AND token = '9nMun52+I9BKbsqlWknQ3nHrp3OKOyGT2yNPT966ZzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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