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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b1e51ce2d6d8a097fd3627fb0d01baf81fd265057207bec99673082f607990' 
  AND token = 'Wq9HOdp1eRt0jopsEwWp9NboLMisVubUzLgrxyosFaY=' 
  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"
    }
  }
}