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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36be2db5d68c9a127abccf489a550ef8fd9aaf8c4a0a5b29baf606e2d5c71779' 
  AND token = 'L5WP2uqvw09Ab6zmfLNc0VwFIMqf+DAXiknYMd8XX5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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