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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d30bb0005da121309a9913465d28c47b94734beb446595b7a2e81c8bb67d07a' 
  AND token = 'zipxxrqtBD8xCp9OymI3M0KtAm9n9KQcj1hp4JxNwpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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