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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef77879ef88a589c4081a81685d6a97754710feba78996b37e12b17d9f9f8d0' 
  AND token = 'N12nxzM/rB5u6ZmhMO8HudAR7u9v/giwOPq7cI7A8Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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