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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3dee9e699ae1f95bf3088b661ebfdf45cd6c5cf670da79d827031c0643e702' 
  AND token = 'XY7Rn0BIXaZ9XwpuzCTrvY5li3cao6b18cp9ukUbq0Y=' 
  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"
    }
  }
}