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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc88564eda20fd8ee124ee781d795c641c03b10eded3f79e37d5d47d2ca3c279' 
  AND token = 'XFdo3huVbASxdcwqF1uqlB/hN5vHGVZ6toZnTj8aK3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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