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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302c77ec4a2f2f4055b95df94a57e34fbdf845003517899416deb1b8ee5f1890' 
  AND token = 'C2Hae9bdM5erOSV3qSqifrcVvvt0OeIqJHSrYnzglvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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