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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d53dcfc1024c67986fee2f97a17349865866bec6e96b2a307adf016f5b3b360' 
  AND token = '4tg0gii8y2jXv8zTrnJEJrTNmD8mDQ5HnljNmHP6Uck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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