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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ad9431fcc42e60f1c4597c00a528547ab6068ec5e8dd34cc2d7fb11a03ccb1' 
  AND token = '5/IHKRhcbmGSUMF3v6YFnLB14uNL99i375sv3WM56dA=' 
  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"
    }
  }
}