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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb8f689f5e9caf3900051c113665dd1628861861da0009d8a3d6967f5a0335f' 
  AND token = 'xXWfGTEU3US8BxztfA80M7wzCxr3PNt/kthZP6UgigU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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