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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb45d4af1370f004a688978d3aa200636519ef12a7eb5f25ed1b386b20c729cf' 
  AND token = 'Q60dJLskm3CYkF/BT4/1sCkiLuN+4hQsBHReuNoO15w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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