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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe10a4bcffce752f2f804d445d5690fb109d62e6092193d8c6101ec785f57eb4' 
  AND token = '5sHiW/5rUd6lUR0iGBTV/KmJffeQ6lb4KRb8WaDjNBo=' 
  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"
    }
  }
}