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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24a3e58797aad73b74aaf52519de08c1d7633b7cd0d096f6b01d59ec448ebc4' 
  AND token = '6+aUm88n9HIB4uq+kGeQv1yLHeOHbCR/Xrrb9sKZ78Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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