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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30989dfbf1f98e22b79bf39a2ef77cf99a03d79b67033a8e532efe9c39ed0bb4' 
  AND token = 'BAfYh6UcUINJnUJThf1zodVBL7A6EAMeLlBgmabB+eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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