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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e606e9c1113ba2b7b52a11d17596dccae6451002971f77134005fe991a4dafff' 
  AND token = 'PtRzq2vfdIxajXFZasTga1w9qOq+ksFfivMXRN3r4bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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