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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39466ed4f5dbb67171d410898497f4f6ff56e4f566e6276e774c608d1e57312' 
  AND token = 'dtKAKS0RJW6Brd8jlzs/x9MSyUfha/DdKuM9CNz47k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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