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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaae214d7ad1fedfe2e4844143ce3a6ca8e4391531e5cd33e916f07cd5fcc7f1' 
  AND token = 'muFVQyG9zVBYqJkYiqhde+TK9bT+S09/kXqWqgjVf48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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