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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5378bd03a18ae49d84033dc1ae7474b5d020c4dd910c1f36695e633580c276' 
  AND token = 'ufXZTmCbmawNAzHN897PTsRGjtUB9Scb/Sc6jHLwwKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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