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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecae5edcb5b8bd52a78aeb8c7771a25a2787cc54d5bc7f1392a1108dcaa8f389' 
  AND token = 'dUACn7SXPNqJ5NzeA4iRRBBbXgThIr40W5K9dyHG9rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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