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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acbf5290d295b1138bb26c514ae660fadacf0884de9593f8db009b3fa378d35' 
  AND token = 'HXWMHVakne9Zy9cD5Ge+mchZEn89Wi/5ny/Xq3MhT7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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