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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06ab7413986b6d3fd44b00d879af1fb4ba4b464b0f642a78a5c4fa06a34a45d' 
  AND token = 'KpB5guU0TdXyU53J5fj0paEVXBRMeVl3q/ZxakGpbo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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