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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4489bd2d62209641a621fa37b81451d6f1bb41193fe66c1d9c8fa7dea45861d6' 
  AND token = '9HFS8LrYN92e9kgscY+zC/LkWl3EfI3Xg1i8A0W4rbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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