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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b91c2118ba1d9f5cef3074d2e2b97043b402108e866a04033f17f8c738601d7' 
  AND token = 'tVB0pLsOU38F1WbM5g+fk6a8VlVmGSh4jrxOqLxabDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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