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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add8b2e066c80c8bba6c7166399f72d93eebf4e9f555f999f8ea4a90e1dab305' 
  AND token = '3zPZsfrppIBGH7wk7/KmUefeIoIfHh3G/8esxABRuyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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