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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25193782965f7063b39d76fad6287a42ecafc54da2daac3a01413cd0bdc889f' 
  AND token = '68z7ibMi9w0ZAjCtZRIH6sMd6vrhwfl7SKCFIVq7CIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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