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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ddca536e0aa47d52dc91a8ffdbef0c09b00ce4a94d28e0f1fe40e95af1398bd' 
  AND token = '5ObCNUXJolr3tbnU+Hgbtl8b/1j5JFW+E5tyzWzuG/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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