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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5348b7760d7e416ce59ffb31de1515bb59e6175ce94f2e6c4bc5ff3179d8552' 
  AND token = '3XnRXz0TuKsCZ+lcjgJruWvizsM78MAFecG3vxlkHJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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