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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bc7953bddbda60cfb12e03186d1c7eef5fc0cb8ef0e935a4da2e52c774733b' 
  AND token = 'h/s3E2G7c6DMP8PSvAB9ahNH4ocZMHG3ZpgtNhTAjTU=' 
  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"
    }
  }
}